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<td ><a href="../qtdoc/index.html">Qt 5.12</a></td><td ><a href="qtquick-index.html">Qt Quick 模块</a></td><td ><a href="qtquick-qmlmodule.html">QML类型</a></td><td >Flipable QML 类型</td></tr></table><table class="buildversion"><tr>
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<li class="level1"><a href="#properties">属性</a></li>
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<li class="level2"><a href="#example-usage">示例用法</a></li>
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<h1 class="title">Flipable QML 类型</h1>
<span class="subtitle"></span>
<!-- $$$Flipable-brief -->
<p>Provides a surface that can be flipped. <a href="#details">更多...</a></p>
<!-- @@@Flipable -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> 导入语句：</td><td class="memItemRight bottomAlign"> import QtQuick 2.12</td></tr><tr><td class="memItemLeft rightAlign topAlign">继承自：</td><td class="memItemRight bottomAlign"> <p><a href="qml-qtquick-item.html">Item</a></p>
</td></tr></table></div><ul>
<li><a href="qml-qtquick-flipable-members.html">所有成员的列表，包括继承成员</a></li>
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<a name="properties"></a>
<h2 id="properties">属性</h2>
<ul>
<li class="fn"><b><b><a href="qml-qtquick-flipable.html#back-prop">back</a></b></b> : Item</li>
<li class="fn"><b><b><a href="qml-qtquick-flipable.html#front-prop">front</a></b></b> : Item</li>
<li class="fn"><b><b><a href="qml-qtquick-flipable.html#side-prop">side</a></b></b> : enumeration</li>
</ul>
<!-- $$$Flipable-description -->
<a name="details"></a>
<h2 id="details">详细信息</h2>
<p>Flipable is an item that can be visibly &quot;flipped&quot; between its front and back sides, like a card. It may used together with <a href="qml-qtquick-rotation.html">Rotation</a>, <a href="qml-qtquick-state.html">State</a> and <a href="qmlexampletoggleswitch.html#transition">Transition</a> types to produce a flipping effect.</p>
<p>The <a href="qml-qtquick-flipable.html#front-prop">front</a> and <a href="qml-qtquick-flipable.html#back-prop">back</a> properties are used to hold the items that are shown respectively on the front and back sides of the flipable item.</p>
<a name="example-usage"></a>
<h2 id="example-usage">示例用法</h2>
<p>The following example shows a Flipable item that flips whenever it is clicked, rotating about the y-axis.</p>
<p>This flipable item has a <code>flipped</code> boolean property that is toggled whenever the <a href="qml-qtquick-mousearea.html">MouseArea</a> within the flipable is clicked. When <code>flipped</code> is true, the item changes to the &quot;back&quot; state; in this state, the <code>angle</code> of the <a href="qml-qtquick-rotation.html">Rotation</a> item is changed to 180 degrees to produce the flipping effect. When <code>flipped</code> is false, the item reverts to the default state, in which the <code>angle</code> value is 0.</p>
<pre class="qml">

  import QtQuick 2.0

  <span class="type"><a href="qml-qtquick-flipable.html">Flipable</a></span> {
      <span class="name">id</span>: <span class="name">flipable</span>
      <span class="name">width</span>: <span class="number">240</span>
      <span class="name">height</span>: <span class="number">240</span>

      property <span class="type"><a href="../qtqml/qml-bool.html">bool</a></span> <span class="name">flipped</span>: <span class="number">false</span>

      <span class="name">front</span>: <span class="name">Image</span> { <span class="name">source</span>: <span class="string">&quot;front.png&quot;</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span> }
      <span class="name">back</span>: <span class="name">Image</span> { <span class="name">source</span>: <span class="string">&quot;back.png&quot;</span>; <span class="name">anchors</span>.centerIn: <span class="name">parent</span> }

      <span class="name">transform</span>: <span class="name">Rotation</span> {
          <span class="name">id</span>: <span class="name">rotation</span>
          <span class="name">origin</span>.x: <span class="name">flipable</span>.<span class="name">width</span><span class="operator">/</span><span class="number">2</span>
          <span class="name">origin</span>.y: <span class="name">flipable</span>.<span class="name">height</span><span class="operator">/</span><span class="number">2</span>
          <span class="name">axis</span>.x: <span class="number">0</span>; <span class="name">axis</span>.y: <span class="number">1</span>; <span class="name">axis</span>.z: <span class="number">0</span>     <span class="comment">// set axis.y to 1 to rotate around y-axis</span>
          <span class="name">angle</span>: <span class="number">0</span>    <span class="comment">// the default angle</span>
      }

      <span class="name">states</span>: <span class="name">State</span> {
          <span class="name">name</span>: <span class="string">&quot;back&quot;</span>
          <span class="type"><a href="qml-qtquick-propertychanges.html">PropertyChanges</a></span> { <span class="name">target</span>: <span class="name">rotation</span>; <span class="name">angle</span>: <span class="number">180</span> }
          <span class="name">when</span>: <span class="name">flipable</span>.<span class="name">flipped</span>
      }

      <span class="name">transitions</span>: <span class="name">Transition</span> {
          <span class="type"><a href="qml-qtquick-numberanimation.html">NumberAnimation</a></span> { <span class="name">target</span>: <span class="name">rotation</span>; <span class="name">property</span>: <span class="string">&quot;angle&quot;</span>; <span class="name">duration</span>: <span class="number">4000</span> }
      }

      <span class="type"><a href="qml-qtquick-mousearea.html">MouseArea</a></span> {
          <span class="name">anchors</span>.fill: <span class="name">parent</span>
          <span class="name">onClicked</span>: <span class="name">flipable</span>.<span class="name">flipped</span> <span class="operator">=</span> !<span class="name">flipable</span>.<span class="name">flipped</span>
      }
  }

</pre>
<p class="centerAlign"><img src="images/flipable.gif" alt="" /></p><p>The <a href="qmlexampletoggleswitch.html#transition">Transition</a> creates the animation that changes the angle over four seconds. When the item changes between its &quot;back&quot; and default states, the <a href="qml-qtquick-numberanimation.html">NumberAnimation</a> animates the angle between its old and new values.</p>
<p>See <a href="qtquick-statesanimations-states.html">Qt Quick States</a> for details on state changes and the default state, and <a href="qtquick-statesanimations-animations.html">Animation and Transitions in Qt Quick</a> for more information on how animations work within transitions.</p>
<p><b>请参考 </b><a href="qtquick-customitems-flipable-example.html">UI Components: Flipable Example</a>。</p>
<!-- @@@Flipable -->
<h2>属性文档</h2>
<!-- $$$back -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="back-prop">
<td class="tblQmlPropNode"><p>
<a name="back-prop"></a><span class="name">back</span> : <span class="type"><a href="qml-qtquick-item.html">Item</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The front and back sides of the flipable.</p>
</div></div><!-- @@@back -->
<br/>
<!-- $$$front -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="front-prop">
<td class="tblQmlPropNode"><p>
<a name="front-prop"></a><span class="name">front</span> : <span class="type"><a href="qml-qtquick-item.html">Item</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The front and back sides of the flipable.</p>
</div></div><!-- @@@front -->
<br/>
<!-- $$$side -->
<div class="qmlitem"><div class="qmlproto">
<div class="table"><table class="qmlname">
<tr valign="top" class="odd" id="side-prop">
<td class="tblQmlPropNode"><p>
<a name="side-prop"></a><span class="name">side</span> : <span class="type"><a href="../qtqml/qml-enumeration.html">enumeration</a></span></p></td></tr>
</table></div>
</div><div class="qmldoc"><p>The side of the Flipable currently visible. Possible values are <code>Flipable.Front</code> and <code>Flipable.Back</code>.</p>
</div></div><!-- @@@side -->
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